TWO more people have been treated for food poisoning after drinking soup made from gau gei (matrimony vine). The couple, Mr Chan, 59, and Ms Lee, 57, were treated briefly for stomach pains and released from Caritas Hospital yesterday morning, bringing the number of gau gei food poisoning cases to 20 this week. Government chemists found two pesticide-contaminated vegetable samples in batches tested from Cheung Sha Wan wholesale market.